exam Maths Puzzle Numerical Ability

this is not a problem from my book. We are working on rational expressions and equations.

(8a^9)^1/2 sqrt 8a^9
------ = ----
(b^3) b^3

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exam Other Question

the absolute value of 6x-8=10, then x= Business and finance. The electricity costs of a business decreased from $12,000 one year to $10,920 the next. What is the rate of decrease?